Transmission/Reception Arrangement and Method for Reducing Nonlinearities in Output Signals from a Transmission/Reception Arrangement

1. A transmission/reception arrangement comprising: a first input, a first output, a transmission output, and a reception input; a transmission path having an input that receives a discrete-value transmission signal having a first component and a second component, wherein the transmission path converts the discrete-value transmission signal into an analog transmission signal and provides the analog transmission signal to the transmission output; a reception path having an input that receives an analog reception signal from the reception input and an output that provides a discrete-value received signal, wherein the analog reception signal comprises a first component and a second component, wherein the reception path converts the analog reception signal into the discrete-value received signal; a switchable connection between the output of the transmission path and the input of the reception path; a first compensation device, connected upstream of the transmission path, having a control input and a signal input that receives the discrete-value transmission signal, wherein the first compensation device distorts the discrete-value transmission signal and provides it to the input of the transmission path; a second compensation device, connected downstream of the reception path to the output of the reception path, having a control input and an output for the discrete-value received signal, wherein the second compensation device distorts the discrete-value received signal; a first switching device, connected upstream of the first compensation device, to the input of the first compensation device wherein the first switching device adopts a first or second state, wherein the first state connects the input of the first compensation device to, the first input and the second state connects the input of the first compensation device to an output of a controllable generator circuit that generates a discrete-value test signal; a second switching device, connected downstream of the second compensation device to the output of the second compensation device, wherein the second switching devices adopts a first or a second state, wherein the first state connects the output of the second compensation device to the first output, and the second state connects the output of the second compensation device to an input of a measuring apparatus, which generates an evaluation signal from a discrete-value calibration signal applied to the input to an output; a calibration apparatus for controlling the first and second switching devices, the generator circuit and the first switchable connection, wherein the calibration apparatus has one input connected to the output of the measuring apparatus and ascertains distortion parameters on the basis of the evaluation signal received from the measuring apparatus; wherein the transmission path further comprises a first mixing device having a local oscillator input for a first local oscillator signal at a first frequency and wherein the reception path further comprises a second mixing device having a local oscillator input for a second local oscillator signal at a second frequency; and wherein the frequency of the first local oscillator signal and the frequency of the second local oscillator signal are set by the calibration device.

2. The transmission/reception arrangement of claim 1 , wherein the second local oscillator signal is formed by a frequency conversion device from the first local oscillator signal and an auxiliary signal.

3. The transmission/reception arrangement of claim 1 , wherein the switchable connection further comprises an attenuation element that attenuates a signal applied to the input of the switchable connection.

4. The transmission/reception arrangement of claim 1 , wherein the first and second compensation devices further comprise a memory unit that stores parameters for altering the first and second components of the discrete-value transmission signal and of the discrete-value received signal.

5. The transmission/reception arrangement of claim 1 , wherein the generator circuit produces test signals at various selected frequencies.

6. A method for reducing nonlinearities in output signals comprising: providing a transmission/reception arrangement having a transmission path and a reception path; applying a discrete-value test signal to an input on the transmission path; deriving a frequency-converted analog transmission signal from the discrete-value test signal at an output on the transmission path; returning the frequency-converted analog transmission signal to an input of the reception path; deriving a frequency-converted discrete-value received signal from the returned frequency-converted analog transmission signal in the transmission path; evaluating the frequency-converted discrete-value received signal in an evaluation device; and providing calibration parameters for the transmission path and the reception path according to the evaluation; wherein evaluating the frequency-converted discrete-value received signal comprises: measuring a signal amplitude and a phase as a function of a signal frequency of the frequency-converted discrete-value received signal; selecting a first signal component from at least two signal components; suppressing un-selected signal components of the at least two signal components; and measuring a power for the first signal component.

7. The method of claim 6 , wherein deriving the frequency-converted analog transmission signal comprises: converting the discrete-value test signal into an analog test signal; and mixing the analog test signal with a first local oscillator signal at a first frequency.

8. The method of claim 7 , wherein deriving the frequency-converted discrete-value received signal comprises: mixing the returned frequency-converted analog transmission signal with a second local oscillator signal at a second frequency; and converting the mixed signal into the frequency-converted discrete-value received signal.

9. The method of claim 6 , wherein returning the frequency-converted analog transmission signal comprises attenuating a signal level of the frequency-converted analog transmission signal.

10. The method of claim 6 , wherein providing calibration parameters comprises: calculating distortion coefficients from at least one amplitude for the evaluated frequency-converted discrete-value received signal and at least one amplitude for the discrete-value test signal; and generating predistortion coefficients from the distortion coefficients.

11. A method for reducing nonlinearities in output signals comprising: providing a transmission/reception arrangement having a transmission path and a reception path; applying a discrete-value test signal to an input on the transmission path; deriving a frequency-converted analog transmission signal from the discrete-value test signal at an output on the transmission path; returning the frequency-converted analog transmission signal to an input of the reception path; deriving a frequency-converted discrete-value received signal from the returned frequency-converted analog transmission signal in the transmission path; evaluating the frequency-converted discrete-value received signal in an evaluation device; and providing calibration parameters for the transmission path and the reception path according to the evaluation; wherein evaluating the frequency-converted discrete-value received signal comprises measuring a signal amplitude and a phase as a function of a signal frequency of the frequency-converted discrete-value received signal; wherein providing calibration parameters comprises: calculating distortion coefficients from at least one amplitude for the evaluated frequency-converted discrete-value received signal and at least one amplitude for the discrete-value test signal; and generating predistortion coefficients from the distortion coefficients.